



influences, bvit which znw'ist 1533;305:2533 uences and reliable and infalligle in ane oo eet or the Invention, enerall stated, is to rovi e an allo for use in ec such in tric instrum nts, such as tem erature con action, althou h idle for lon eriods. trolled or indicatin ins ents, which are he a ticular ob ect of m invention,.' idle for lon perlod s ut must have contact therefore, 15 to rovide an allo which will sux'faces w ch will make certain and reliable mee t Insurance n erwx-iters contact when ca ed u on to function and aboratories re ulations Aandkwhich, in addin ust, therefore 'b tlon to its value for use in inst, uments ofthe articular ty e preferred to, is ada ted for i h'con activity atmos henc 0:: P

hl eficxent use where h g im ortant factors,

which contact ternn roof aoainst deleterious other ces which would otherwise render them unreliable and uncertain or inoper l w resistance are tive in action an example of a tem era such as in tele hone, tele ra h and radio ininstrument of the character 'and circuitso In carr in m invention into ractice I de n w allo for e ur oses deptoxim tel referrstatic switches e or other alarm c uits whose contacts are ommonl eaosed to the oxidi ing efi'ec1:s of air or st am n .30 e 1: many cases to the corrosive inflli'eiles' of 'lfgle'e rpl'oportlons ma 0 some nitric and sul huric acid va ors or rine sllght rees de endent u on the sources or other ases and characteristics of the metals elves Heretorore, so far as I am aware; o con- But the ro ortions named are desirable tacts for ins ruments of such 1:, e ave'been essentia or general conditions uch n successf u in meetin ro ortio or exam le, rovide an o of suitable medi hardn ss, w ereas the propormadewhich have bee full re ulations of ri s re uirin such conation and corroas been necessar ents which are sion, an ractice to em lo s satlsfactol'ry onl o a-certain de 'ree, but faJl racticall eoretically an i; should b reliable instrum a result of lon and extensive ex er ments I have succeeded in roducin a fecting an allo w i eminently suitable for use in ma g contact terminals for such ir, steam, ater, nltnc or so class of an whic allo meets huric acids or chlonne or other ases, a

ents of the Insurance Un er ualit iven it b the old in th re oris to tion em lo ed, and has low electric resistand electrical conductivity, a 4

hi h

wn sa is of low re stance d ance conductivi and proof a mlzlsb t e oxidi g ualit iven it b the silver in t a a nst the corroc tion employedhese ualities in eneral 'tric, sul huric make it 'pax'ticularly valuable for llse as electrical contacts in tele hone, tele ra h and currents e an f the va ors of m and other acids or chloli'rle or other cases, and

radio instruments where srn em lo ed, and hi h conductivit low resistwhich, therefore,

in the make tori - a be maae a applied for use in any suits. 1e wa I do not limit myself in this particular, but, for ur oses of exem in z plification, I may seats that e use of the alloy f r ti e cbnt act termi- St; thereby mske posin sdditicn, this composition of gold. and silver, rtions, prod an 9110 whldl uces is o particular value a. clrcult closin device in which a ointed contact te a. V 

